My character randomly becomes invisible, and no one can see me.

This started happening 2 days ago when my character randomly became invisible while I was questing. I thought it was about my addons until players in my group told me that they can't see me either, I thought they were joking at first and I asked to take a screenshot from a friend of mine and he confirmed I am indeed invisible. I have tried relogging, repairing the game, deleting the interface and WTF folder and redownloading the game but none of'em seems to have worked, this looks more like a Blizzard side of a problem.

Now my question is, has anyone had something similiar happen to them before? If so, how did they fix it? I have turned off war mode and stopped playing PvP in case I get banned for exploiting game mechanics.